Mine drill support and driving mechanism



Dec. M, w48. l.. J'. FELLAY ET AL NINE DRILL SUPPORT AND DRIVING NEcHANIsN 3 Sheets-Sheet 1 Filed Sept. lO, 1947 INVENTORS f ffymv ./v'a @flawl @I mi Dec. 14, 194s. L, J, FELLAY T L 2,456,056

MINE DRILL SUPPORT AND DRIVING MECHANISM Fi-led Sept. lO, 1947' i v 3 Sheets-Sheet 2 Je J5 6p 4/61* ya y Je 36. i j "f J9 4i/50 J5 5 y 6,6,

J6 L if j `-67 y O L I 34! l 26 2?//361 JJ M9 IN VEN TORS Dec. 14, 1948. i1 ,.1. FELLAY ET'AI. 2,456,956'

A MINE DRILL SUPPORT AzND DRIVING MECHANISM Filed Sept. 10, 1947 3 Shets-Sheet 3 @di INVENTORS I Patented Dec. 14, `1948 MINE DRILL SUPPORT AND DRIVING MECHANISM Louis J. Fellay and Harry H. Kavanaugh, Peoria,

Ill., assignors to Dooley'Bros., Peoria, Ill., a corporation of Illinois Application September 10, 1947, Serial No. 773,270

(Cl. Z55- 51) 11 Claims. 1

Our present invention relates to mine drill support and driving mechanisms, and more particularly to such a mechanism which is readily placeable and capable of a wide range of adjustment for drilling in coal mine shafts and the like preparatory to the placement of explosive charges.

One of the objects of our invention is to provide a mine drill support and driving mechanism embodying a supporting tram which is readily maneuverable into a desired position and is selfsustaining at that position and has mounted thereon a drill carrying and driving arm adjustable for directing a drill to a multiplicity of positions and directions.

As another object, our invention comprehends the provision of a mine drill support and driving mechanism incorporating a drill carrying arm selectively swingable to adjusted positions in transverse planes and having at its free end a drill driving mechanism which is furth'er adjustable in a plurality of directions and planes.

This invention further has within its purview the provision of a mine drill support and driving mechanism having a plurality of selective adjustments covering a Wide range of drill'angles and positions, and all of which adjustments are subject to control from a convenient operating position.

For another object, our invention includes the provision of a mine drill support embodying a turret rotatable in one plane relative to a support and a drill carrying arm svvingable relative to the turret in planes transverse `to the plane of movement of the turret, and at the free end of which drillcarrying arm a drill driving mechanism is .w

mounted for substantially universal movement relative to the arm to adjusted positions,

Other objects and advantages of the invention will be apparent from the following description and the accompanying drawings in which similar characters of reference indicate similar parts throughout the several views.

Referring to the drawingsof which there are three sheets: l

Fig. 1 is a general side elevational view of a mine drill support and driving mechanism incorporating a preferred embodiment of our invention;

Fig. 2 is a fragmentary side elevational view of a portion of the structure shown in Fig. 1 drawn to a larger scale and having portions cut away to show certain details;

Fig. 3 is a fragmentary side sectional view of a portion of the structure shown in Figs. 1 and 2;

Fig. 4 is a top plan view of the portion of the structure shown in Fig. 3;

Fig. 5 is a fragmentary side sectional view, drawn to an enlarged scale, of a different portion of the mine drill support structure shown in Fig. l; and

Fig. 6 is a fragmentary top view, partially in section, and viewed substantially as indicated by the lines 6-6 and accompanying arrows in Fig. 5.

Considered generally, the exemplary form of our mine drill support and driving structure which is shown in the accompanying drawings for illustrative purposes includes a tram I0 adapted to be power driven in a mine to shaft positions at which drilling is to be done for the setting of explosive charges. At such positions the tram provides a stable and stationary support for a drill supporting arm I2, which arm is swingable in transverse planes and carries at its free end a drill driving and feeding mechanism I3. The drill driving and feeding mechanism is practically universally adjustable with respect to the free end of th'e arm for nally determining the position and direction at which the hole is to extend into the vein. The movable parts of the arm supporting structure and those which carry the drill driving and feeding mechanism at the end of the arm are so equipped with locks and controls that they may all be readily manipulated by an operator standing near the free end of the arm and in such a way that when the auger has been started for the drilling of a hole, it will continue to drill and feed Without being additionallyguided by the operator.

As far as the details of the tram are pertinent to the instant invention, it includes a relatively heavy and rugged base plate structure I4 supported for movement on wheels I5 and electrically driven bypower supplied through `a main power cable I6. In operation, the main power cable I6 is normally wound upon a reel I1 and extends therefrom through a rear guide I 8. Thus, as the tram moves away from the power connection to the main cable, the cable unwinds from the reel I'I behindthe tram and extends to the position of use in themine.

" When the tram has been moved to a position for drilling operations, side braces, such as I9, which are carried for swinging .movement relative to thevsides of the base plate structure I4 are swung downwardly to engage and dig into the shaft iioor so as to prevent the rearward movement of the tram. In the disclosed embodiment of the tram structure, tension springs such as 20. provide resilient toggle connections which hold the side braces I9 in either their ilo-orengaging or retracted positions. Having the required stability and rigidity in the supporting structure for the drill carrying arm which, in the present instance, is provided by the tram, and having that. supporting structure movable when desired, facilitates the placement of the supporting structure and avoids the necessity for the use of posts or the like which are manually moved and set into position.

As shown in Figs. 1 to 4 inclusive, an index plate 22 is desirably circular in shape and is` secured to the upper surface of the tram base.

plate structure i4, desirably at theV forward end` thereof. Centrally of the index plate 22 and extending upwardly therefrom in substantially perpendicular relationship to the surface of the plate, is a hollow stud shaft 23 which, as shown in Fig. 3, is preferably secured to the index plate by welding, as at 24. Bearings 25 and 26, desirably of the roller thrust bearing type, are disposed near opposite ends of the stud shaft 23` and within a sleeve 21. The lower of the bearings 25 is supported by a spacing collar 28. on the stud shaft 23 adjacent the surface of the index plate 22.; while shoulders 29 and' 30 serve. to space the bearings within. the sleeve and provide, support for the upper bearing. 2-8. In the disclosed embodiment of our invention, a nut 32 threaded onto the upper endl of the stud shaft 23 and having a washer 33. between it and the bearing 26 holds the parts of the bearing and sleeve assembly in assembled relationship. A cap 34 secured tothe upper end of the sleeve 21 and, overlying the end of the stud shaft isdesirable for preventing dirt from getting into the bearings.

A turret 35 having a substantially cylindrical side Wall 36, a sloping top wall 31 and a. detach-` able cover plate 38, is carried for rotational movement relative to the indexY plate and base plate structure by a plurality of webs or vanes 39 secured to and extending between the outer surface of the sleeve 21 andthe inner surface of the turret side wall. Along the higher or forward portion of the. turret side wall. 35,. bearing support plates 40 and 42 are` secured thereto in substantially paralle1 relationship and atseparated positions on the periphery ofthe turret. The general. planes of.' the support plates 48 and 42 in addition to being substantially parallel to one another, are also substantially paralle1 to the axis of the stud shaft 23.. Between. the support plates 40 and 42, an. open slot 43 is provided in the side Wallof the turret.

On the outer surfaces and near the tops of the support plates 40 and 42 projecting bosses 44 andV 45, respectively, carry stud, bolts 4.6 and 41 which extend inwardly in opposed and` coaxial relationship and. have inner end. portions which serve as stud shafts journaled in and. supporting the bearings 4 8. and 49 which4 are. integrally formed on and as. a part of. a4 support bracketv 50. Inthe disclosed embodiment of our invention the support bracket 50 is` of generally triangular shape as viewed fromthesides andhas substantially parallel and separated side wall portions 52. and. 53 upon which the bearings 48 and 49y are integrally formed, andv which side wall portions 52 are connected by an integral portion 54 intermediate the side wall portions and displaced from the bearings 48 and 49. At a position displaced from the axis of the bearings 48 and 49, asV well as4 from the integral portion 54, bearings such as 55 provide supports for stud' shafts which carry a gear box 56 for rotational movement between the side wall portions 52 and 53. A driving motor 51 is secured to and supported by the gear box 56.

On the side of the integral portion 54 substantially opposite. the bearings 48v and 49, that integral `portion is cylindrical in shape and projects away from the bearings 48 and 49 with an axis extending between the side wall portions 52 and 53 to provide a seat 5B for receiving and supporting the end of a piece of relatively heavy cylindrical tubing 59 which comprises a substantially rigid part of the drill supporting arm I2.

As indicated at 68' in Figs. 2 and 3, the tubing 59, issecured to the integral portion 54 of the bracket by an annular welded seam.

Extending from the end of the gear box 56 and into the interior of the turret 35 from the side of the gear box opposite the motor 51, is a cover sleeve 92 for a screw mechanism including a threaded shaft 63. One end of therthreaded shaft E3 is providedv with a headed portion 64 through which a cross pin extends, and which cross pin is journaled in bearings 66 provided in bracket plates 61 secured to the internal side wall' surface of the turret. Thus, one end. of the. threaded shaft. is anchored for rotational movement to the interior of the turret at a position considerably displaced from the axis of the stud' shafts 46 and 41 which carry the support bracket 58 upon which one end of the drill carrying` arm I2. is supported. The threaded shaft 63 extends into the cover sleeve 62* and is threaded into that sleeve.. The cover sleeve 62 is rotatably supported relative to the gear box 56. and is driven through suitable gears within that box by the motor 51. Hence, operation of the motor, which is reversible, in one direction or the other, effects extension or retraction of the screw mechanism.

Since the anchored end of the threaded shaft 63 is displaced from the axis ofthe bearings 48 and 49, and since the axis of the studs which connect the gear box 56 to the support bracket 50 is displaced from both the axis of the bearings 48 and 49 and the integral portion 54of the support bracket, the triangular relationships are such that extension and retraction of the screw mechanism swings thesupport bracket about the axis of the bearings. y48 and 49 and thus varies the angular position of the drill carrying arm in a plane transverse to the surface ofthe index plate 22,

From the foregoing. description, it may be readily understoodl that the turret provides a rugged support for one end of the drill carrying arm, and also supports that arm for swinging movement in a horizontal plane. Also, in association with the electrically driven screw mechanism and thev support bracket 59, the drill carrying arm is swingable relative to the turret in a vertical plane. The mechanical characteristics of the screwf mechanismr are such that when adjusted to any particular position by' operation of the motor 51, the drill. carrying' arm is. firmly' supported and held in that vertical position when the motor is stopped.

Since the drill carrying arm provides a support for the drill driving and feeding mechanism whichV is to be adjustable to fixed positions held during the drilling operation, itis also necessary to provide a locking mechanism for holding the turret in any one of a multiplicity of positions to whiehit may be adjusted. For this purpose,` we have provided' in the index plate an annular of the stud shaft 23. These openings 68, as shown in Fig. 4, are disposed at positions radially outward of the turret and coact with locking pins 69 and 10 (Fig. 2) of a locking mechanism 12 carried on the exterior surface of the turret side wall.

Having particular reference to Fig. 2, the locking pins 69 and 10 are carried for linear sliding movement in bearing apertures 13 and'14 respectively in a block 15 which is secured to the outer surface of the turret side wall closely adjacent the surface of the index plate 22. The spacing of the pins -69 and 10, by preference, is different from that of the openings 68, so that only one of the pins is engaged in, an opening at any one time. Such spacing of the pins provides smaller increments of Variation between locked positions than is provided by the normal spacing between the holes 68. Y

In the disclosed embodiment of our invention, a triangular plate 16 is supported for swinging movement relative to the outer surface of the turret side wall by suitable means such as a cap screw 11. This plate serves somewhat the purpose of a bell crank. That is, connected to one corner thereof and supported therefrom through a cross pin 18, is a lift block 19. This lift block is drilled to receive the projecting ends of the pins 69 and 10 above the block 15 and has compression springs 80 and 82 disposed therein which normallybias the pins 69 and 10 respectively toward the surface of the index plate 22. On the outer surface, thelift block 'I9 has elongated slots 83 and 84 therein which adjoin lower end portions of the drilled apertures therein which receive the pins 69 and 10. Projecting cross pins 85 and 86 secured to. each of the pins 69 and 10 extend into the slots 83 and 84 respectively and serve to lift the pins 69 and 10 when the lift block is moved upwardly. The positions of the cap screw 11 which carries thev plate 16 and the cross pin 18 which connects the plate 16 to the lift block 19 are relatively disposed in such relation that movement of the plate 16 in one direction lifts the lift block to effect removal of the engaged pin from one of the holes in the index plate 22. While thus retracted, the turret is free to be rotated.v Upon release, the pins are free to relock the turret in its set position.

By preference, the plate 16 is biased toward a position effecting locking engagement of the pins 69 and '10 by a compression spring 81; one end of the spring 81 being fixedly supported by plate 88 secured to the outer side Wall surface of the turret while the other endis carried within a tubular housing 89, one end of which is connected to the plate 16 at a position opposed to that of the cross pin 18. For the protection of the locking mechanism 12 rand its associated parts, it is our preference that a plate 9| is secured `to the side wall of the turret above those parts. This plate projects outwardly from the turretside wall as shown in Figs. 2 and i to provide a cover over those parts.

For convenience in the operation of our drill supporting and driving mechanism, the controls for the various locks and motor driven parts are desirably located on the drill carrying arm at a position near the free end thereof and convenientto the drill operator. With this in mind, a iiexible operating wire 90 has one end anchored to an attaching element 92 yon the plate 16 at a position displaced from the c ap screw`1'l and cross pin 18. This operating wire 90 Vextends the spindle portion of the insert.

through suitable guides such as 93 and into the interior of the tubular portion of the drill carrying arm I2. At the end opposite the tting 92 and at a position convenient for operation, the operating wire is attached to a lever arm 94 carried internally of the tubing 59 by a shaft 95, which shaft is journaled in the tubing wall and carries an operating handle 96 adjacent the exterior of the drill carrying arm.

Closely adjacent the position of the handle 96 on the drill carrying arm I2, a conventional reversing switch 91 is secured to the drill carrying arm and has a switch actuating handle98 conveniently exposed at one end thereof. Electrical connections from the switch 91 to the reversible driving motor 51 are made through suitable conduits 99, as indicated in Figs. 1 and 2.

It may now be readily understood that it is the purpose of thetram to transport, locate and support the parts of the drill supporting and driving mechanism to and at an approximate position of use from which holes may be drilled at various associated and related positions and at various elevations by adjustment of the position of the drill carrying arm. At such adjusted position, the drill carrying arm provides a support for the drill carrying and feeding mechanism I3 stably to hold the auger during a drilling operation. In order to provide additional flexibility for adjustment of the drill angle and position', as well as for obtaining access to more diicultly reached positions, additional variable and adjustable parts are interposed between the free end of the drill carrying arm and the drill carrying and feeding mechanism.

Having reference to Figs. 1, 5, and 6, a first swivel head |00 is mounted at the free end of the tubular arm 59, and has opposed side arms |92 and |03 formed integrally therewith and projecting outwardly therefrom in substantially parallel relationship and longitudinally beyond the end of the tubular arm. As shown in Fig. 5, an insert |04 has an enlarged cylindrical end portion |05 which is fed into and secured within the end portion of the tubular arm 59. As an integral part of the insert |04 and projecting axially from the enlarged end portion |05, is a spindle portion |06 of smaller diameter than the interior of the tubular arm 59. Bearings |01 and |09 which are desirably of the roller thrust bearing type support the first swivel head for rotational movement relative to and substantially coaxially with the longitudinal axis yof the drill carrying arm. The bearing |08 is located by a shoulder |09 on the spindle portion |06 of the insert |04` adjacent the enlarged end portion |05. Shoulders ||0 and |I2 on the inner surface of a sleeve portion I I3 of the first swivel head separate and locate the bearings. A nut I I4 threaded onto the end of the spindle portion |06 and an associated washer ||5 serv-e to hold the swivel head in assembled relationship with respect to In our disclosed structure an integral skirt portion IIS on the first swivel head overlies the outer and marginal portion of the tubular arm. The marginal edge -of the skirt portion I I6 which faces the tubular arm 59 has therein a series of circumferentially spaced radial notches I II which are adapted to coactwith similarly spaced projecting tongues I I6 on the end of a linearly movable slide I9 to hold the first swivel head in predetermined rotational positions relative to the end of the tubular arm. The slide I I9 preferably conforms substantially to the surface of the tubuhandle portions project outwardly from the sides l of the slide block 29 and overlie the tubular arm 59 lfor convenient access in manually effecting release of the first swivel head.

i'A second swivel head is disposedfbetween the opposed side arms |92 and |93 of the rst swivel head and rotatable relative thereto about the axis of opposed and aligned Iinwardly projecting studs lv|26 and |21, which studs extend through the projecting ends of the opposed side arms |02 and w3. Thisy second swivel head has one hub portion |28 about the axis `of the studs |26 and |21 which hubjportion is partially encircled by and has secured thereto, by integrally formed webs |29 and |135, an 'annular segment |32, which segment presents .a generally arcuate outer surface having therein a series of circumferentially and equally spaced notches |33. The notches bypreference are substantially V-shaped and' symmetrically disposed with respect to radii of the segment.

`The axis of .the studs, as Well as the segment |32, is substantially perpendicular to the longitudinal axis of the tubular arm 59.' Also, the di arneter and position of the segment |32 are desirably such that it extends between the opposed .side arms |52 and |03 of the first swivel head |55, with the periphery of the segment closely adjacent the skirt portion of the first swivel head.

Pairs of lugs 34 and |35 in spaced relationship are integrally formed on the outer end por `tion of the first swivel-head at diametrically opposed positions adjacent the periphery of the segment |32. Between the lugs of the pairs |34 Aand |35, respectively, pawls |36 and |31 are supported for rotational movement by pins |38 and |.39which extend through the lugs and the pawl. The pawls have projecting portions |45 and |42 aligned with and adapted to fit into the notches |33 in the periphery of the segment 32. Also, compression springs |43 and |44 disposed between the pawls and projections |45 and |46 on the rst swivel head bias the pawls into engagement with notches |33, of the segment. The angular dispositions of the pawls are such that one of the pawls prevents rotation of the segment in one direction, while the other of the pawls prevents r0- tation thereof in the opposite direction. Handles |41 and |43 are provided on the pawls for eiecting manual release thereof when desired. Plates |49 and |59 secured to opposite end surfaces of the segment |32 and projecting beyond the arcuate surface thereof are adapted to engage the respective Apawls and provide stops preventing movement of the second swivel head beyond a position in which it is engaged by the pawls.

In addition to the hub portion |28, the second swivel head has a hub portion |52, the axis of which is perpendicular to the axis ofthe hub portion |28. This second hub portion desirably has therein a bronze bushing |53 which provides a bearing for a spindle portion |54 of a third swivel head |55. At one end of the spindle portion |54, the third swivel head |55 is provided with.A an outwardly projecting shoulder ,|56 which engages Aone end surface of the hub portion |52. 'Atthe other end of the hub"portion"|52, a Vretaining plate `|57 is secured to 'the end of the spindle portionr |54 by fastening means such asa cap screw |58; the retaining 'plate |51 .overlying the end surface of the hub portion |52 iopposi'te the shoulder |"5t` to hold the thirdswivel head in place with reference to the second swivel head.

At the end adjacent the shoulder |56, thethird swivel head |55 includes a pair kof spaced and substantially parallel `arms |59 projecting 'away from the spindle portion |54 and providing bear- `ings |60 'in which 'a cross pin |6| (Fig. l) is rotatably disposed to support the drill driving said feeding mechanism relative thereto. The disclosed drill driving and feeding mechanism includes a driving motor |53 at the forward end of'which and mounted thereon is a gear box |64 enclosing suitable reduction gears through which anauger chuck and drive clutch mechanismllB'S and a feed screw (not shown) are driven. Extending rearwardly from the gear box |64 in alignment with the auger chuck and clutch mechanism, an elongated jtubular housing |66 encloses the drill feed screw and serves asa'han'dle useable by the operator to direct the drill relative to the end of the drill carrying arm 'I2 whilea hole is being started. After such a hole is started, the 'auger maintains the selected position of the drill driving and feeding mechanism and is automatically fed into the hole vby the action of the feed screw. Power for the driving motor |53 is supplied through aiiexible insulated cable |61.

For convenience in operation and the replacement of augers the chuck and clutch mechanism lationships thereof lwhich additionally impart to the structure a wide range of flexibility in use, as well .as facilities for speed in operation.

v While wehave illustrated and described a preferred embodiment of our invention, many Inodiflcations may be made without `departing from the spirit of the invention, and we do not wish to be limited to the precise details set forth, but desire to avail ourselves of all changes within the scope of the appended claims.

Having thus described our invention, what we claim as new and desire to secure by Letters Patent of the United States is:

1. A mine drill supportand driving .mechanism comp-rising, in combination, a, base plate, a turret lsupported for rotational movement relative to the base plate, a latch mechanism for locking the turret in anyone of a multiplicity of positions relative to the base plate, a drill carrying arm supported at one end by the turret for swinging movement in a plane transverse tothe plane of said rotational movement, a motor driven screw mechanism for determining the position of the arm relative to the turret, a drill driving and feeding mechanism mounted for practically universal swinging movement at the other end of the drill carrying arm, and a manually operable control element for actuating said latch mechanism and a switch for controlling said motor driven screw mechanism both mounted on the drill yc'arryingarin near said drillA driving and feeding mechanism.k f

' 2. A mine drill support and driving mechanism as set forth in claim 1 wherein' the parts for mounting the drill driving andfeeding mechanism relative tothe drill carryingarminclude a rst swivel head supportedfor 'rotation in one plane relative to the arm., latch means for locking said first swivel head in selected positions, a second swivel head supported for rotation relative to the 4iirst swivel head in a plane transverse to the last mentioned plane, latch means for locking the second swivel headV in selected positions relative to the rst swivel head, and means connecting the drill driving andlfeeding mechanism to the second swivel head for swinging movement.

3. A mine drill support and driving mechanism k ras set forth in claim 1 wherein said latch mechanismfor locking the turret in any one of a multiplicity of positions comprises a plate secured to said base plate and havingtherein an annular series of holes concentric with the axis of rotational movement of the turret and in circumferentially and equally spacedl relationship, a block carried by said turret and supporting a pair of lock pins in diametrical alignment with said holes and for linear movement toward and from said holes, said lock pins being spaced Aa distance proportional to and different from the circumferential spacing of said holes, springs biasing the pins into engagementwith the holes, and a pin lifting mechanism for retracing the pins from engagement in said holes.

' *4. In a mine drill support vand driving mechanism, the combination comprising-an index plate havingv a circular series of circumferentially spaced holes therein, a stud shaft secured to and projecting in normal relationship to the surface of the index plate and concentrically disposed withv reference to saidl series of holes, a turret supported for rotation on saidstud shaft, a latch mechanism for locking the turret in xed positions relative to the index plate and including a pin carried by the turret "fo`r7 Ymovement to and from engagement with the' holes in said rindex plate,a drill carrying arm supported at one end by the turret and projecting therefrom, lsaid drill carrying arm being supported relative to the turret for swinging movement in a plane transverse to the general plane of the index plate and having a side lever arm thereon projecting angularly from the drill carrying arm, a motor driven extensible and retractible screw mechanism having one end connected to the turret and the other end connected to the side lever arm at a distance from the drill carrying arm so that extension and retraction of the screw effects swinging movement of the drill carrying arm, and a drill driving and feeding mechanism mounted at the free end of the drill carrying arm, said latch mechanism for locking the turret in xed positions relative to the index plate also including a spring for biasing said pin toward the index plate, and a flexible control element extending to an actuating lever on the drill carrying arm.

5. In a mine drill support and driving mechanism, the combination comprising an index plate having a circular series of circumferentially spaced holes therein, a stud shaft secured to and projecting in normal relationship to the surface of the index plate and concentrically disposed with reference to said series of holes, a turret including a side wall of generally cylindrical shape and a cover plate and supported for rotation on said stud shaft, a latch mechanism for locking the turret in fixed positions relative to the index plate and including a pin carried on the side wall of the turret for movement to and from engagement with the holes in said index plate, a drill carrying arm supported at one end by the turret and projecting therefrom, said drill carrying arm being supported relativeto the turret for swinging movement inv a plane transverse to the general plane of the index plate and having a side lever arm thereon projecting angularly below the drill carrying arm, and an extensible and retractible screw mechanism having an exposed threaded element `at one end connected to the interior of the turret and protected thereby and an externally protected threaded element at the other end connected to the side lever arm at a distance from the drill carrying arm so that extension and retraction of the screw mechanism effects swinging movement of the drill carrying arm relative to the turret.

6. In a mine drillsupport and rdriving mechanism, the combination comprising an index plate having a circularly disposed series of equally spaced openings therein, a turret supported for rotational movement relative to the index plate, a locking pin support block secured to the turret and having vopenings therein spaced in relation to and differently than the holes of said series, turret holding pins mounted in said openings in the support block'for sliding movement toward and from said openings in the index plate, a lift block mounted on said turret adjacent said support lblock for linear movement toward and from the support block, said lift block having pin receiving openings and adjoining slots of predetermined lengthy therein and slidably receiving portions of said turret holding 'pins which project from the support block, side pins secured to turret holding pins and projecting therefrom for limited sliding movement in said slots, springs housed within, the lift block and biasing the turret holding pins into engagement with the index plate, lever meansfor moving the lift block to effect disengagement of the holdingpins from the turret plate when the side pinsreach their limit of movement in said slots, spring meansfor 'biasing the lever means' to move the lift block toward the support block, and means for actuating the lift block and turret holding pins against the biasing force of said spring means.

7. In a drill support and driving mechanism, the combination comprising a drill carrying arm providing a movable drill support, and a drill carrying and driving mechanism mounted on the drill carrying arm through a plural swivel connection having serially connected swivel heads rotatable in transverse planes, said drill carrying and driving mechanism being journalled for free swinging movement in one plane relative to one of the swivel heads, said one of the swivel heads being journalled for free rotational movement relative to a second swivel head in a plane transverse to the plane of swinging movement of said one swivel head, said one of the swivel heads and said second swivel head remaining free respectively for said swinging and rotational movements in transverse planes during operation of the drill carrying and driving mechanism, said second swivel head being supported for rotational movements in planes transverse to one another, and holding parts for securing said second swivel head in adjusted positions in each of the last mentioned transverse planes- 8. In a drill support and driving mechanism, the combination comprising a drill carrying arm 'amerite lil providing a fiiiovble drill support, :and a fdrill carrying #and Vdriving mechanism mounted on 'the drill carrying arm lthrough a xplural .swivel connection having `serially connected .-swivel heads rotatable in ltransverse `planes,saidlswivel heads including `a first :swivel A-head which lis Inormally 'free -to lrotate iinA fone 'plane 'and 'two additional swivel heads rotatable vin planes and about axes transverse vto one Lanother .and eachin a plane transverse Ito the :plane di" lrotation iof the first swivel head, means for .normally :holdingieach of said "two additional rswivel iheads 2in adjusted `positions, said drill carrying `and Adriving mechanism being carried Iby'said ifrst swivel head and normalty Vfree for f swinging .movement relative theretoabout anaxisiwhose planeroi `revolution is'substantially `parallel Ato ithe axisof rotation 0f one .otsaiditwaswiveliheads.

' 9.. ,'Inza Ydrillsupplcrt:andaiiriving mechanism vas dened in claim 8, the axes of rotation ofsaid twoiswivel .-'heads andthe axis 'of rotation fo said .first swivel headhavingrazpoint :at -which they lintersect.

llO. ln famine *drills'upprt and ,drivingn'nech- .anism, Cthe combination comprising ia @substantially rigid :drill marrying zam, :a support relative .to which noneaendeof the arm isrswingable to :adjusted postions,razdrillf.driving andffeeiiingmech- .anism, tand a :plurality tof `swivel heads Y`through :nism .is supported .for swinging rmovement rin transverse mlanesvirelative fito :the free :end 'of sth'e .drill carrying:armpsaidplurality 0f .swivel :heads including' a trst .swivel head1-supported atfone end of `lthe .arm for :rotation about an :axis extending longitudinally of vrthe'arn'x, arsecond Vswivel head supported Eby the rst swivel 'head rior rotation .about 1an :axis transverse ,to rthe `axis -:of :rotation of the 'first 'swiivel l"head, aretaining mechanisms disposed :fat 'adjacent positions .on the arm fand first swivel head -respectively :for holding `each of the firstfandrsecond swivel thead's inipreselected positions, a third swivel head :support-ed :'.bythe second :swivel head for irritation about fan saxis transverse `toathe :axes of :rotationfoftherst and second swivel sheads, ithe :axes of .rotational movement of the secondrandithirdfswivel headszhaving sa moint dfintersectioniwhichris YsubstantiallyA coin* cident with the axis of rotation movement Aof tthe rst swivel yhead rand @a motor ywhich comprises a part of #the ;drill fdr-living and feeding ymechanism mounted `for --rotational swinging Y'movement -on the third .swivel lhead l at Ya position vclose to said axis of rotational :movement yoi the first swivel head.

11. Infa mine drill :support-and driving -mechanism, the combinationcomprising-a substantially rigid drill vcarrying arm, ya support relative to which one end of ythezarmfis-swingable to adjusted positionsadrill driving and `feeding mechanism, .andV a 'plurality'oiswivel headsthrough whichthe .said drill idriving andfeeding mechanism is.sup ported vfor swinging movement in 'transverse lplanes relative to thefree endfof vthe-drill .carrying arm, said swivel heads beingg supported for rotation about axes 'which'are Asuccessivelyper- .pendicular to @one another :and including a )first swivel head 'rotatableiabout the longitudinal .axis ofthe ldrill lcarrying sarm, Ia-mechanism ifor determining :the relative :positions of the:arm and said first-swivel head, fa;second swivel head mounted 'for rotation :in either direction relative to said irst swivel :head :about an axis transverse :to the longitudinal -axis fof :the l drill lcarrying larm, and ka manually operablelatching. mechanisme-for determining the .lposition fof fthe second swivel head, said latching mechanism :including dual Lpawls,

lone =.of Vwhich Jpawls effective `to :arrest rotation of .the .second swivel head in one direction .and the other pawl being effective .to ,arrest rotation of .the second swivel head in .the other Iof .the two opposed directionsof rotation.

' LOUIS HARRY H. VKAVANAUGH.

AREFEREN'CES CITED The following .references fare Lof record in v'the ,le of this apatent Number I.'.IIanie Y.Date

l885,295 Robinson Nov. 1, `1932 .2,10%3341 Curtis. Jan.f4, 1938 2,318,595 Curtis -May 11, :1943 

